/Engine/Source/Runtime/Engine/Classes/Kismet/GameplayStatics.h
Unload a streamed in level (by Object Reference)
static void UnloadStreamLevelBySoftObjectPtr ( const [UObject](API\Runtime\CoreUObject\UObject\UObject) * WorldContextObject, const [TSoftObjectPtr](API\Runtime\CoreUObject\UObject\TSoftObjectPtr)< [UWorld](API\Runtime\Engine\Engine\UWorld) > Level, [FLatentActionInfo](API\Runtime\Engine\Engine\FLatentActionInfo) LatentInfo, bool bShouldBlockOnUnload )